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...he pen that in position of rest remains lateral, whose rotation involves a torsion applied laterally to the bag with the relative wringing. Compared to ''[[twist filler]]'' the substantial innovation introduced by [[Swan]] was to allow only a l

...r'' is based on the compression of the reservoir through the exercise of a torsion on it. In this type of filling in general the tank is made not with a sac, ...ubber tank could break due to the considerable effort imposed on it by the torsion.

...es was the [[Perfecta]] model, produced in the early 20s, with a [[torsion filler]] and a complex safety system as the first example of automatic filling fo ...ns, also ''Tibaldi'' produced a [[Tibaldi Flattop|new series]] of [[lever filler]] ''[[flat top]]'' pens, clearly inspired by this model. The new pens were